The One and Done Workout is a fitness system built around a specific form of high-intensity interval training called SIT (sprint interval training). Unlike traditional HIIT, which can involve long recovery periods, SIT focuses on short bursts of all-out effort (as little as 20–30 seconds) followed by brief rest. A full session typically lasts 10–15 minutes.
The "One and Done Workout Manual" is available for download in PDF format. You can find it through a general web search. Be sure to verify the authenticity of the source to ensure you're getting a legitimate and safe download. The One and Done Workout is a fitness
Always consult with a healthcare professional before starting any new exercise program. which can involve long recovery periods